S
M
T
W
T
F
S
30
91°
49°
31
89°
38°
1
80°
33°
2
76°
35°
3
77°
40°
4
81°
41°
5
85°
38°
6
87°
37°
7
81°
37°
8
77°
36°
9
76°
36°
10
78°
33°
11
72°
33°
12
72°
35°
13
75°
38°
14
81°
44°
15
84°
43°
16
76°
35°
17
72°
34°
18
72°
36°
19
72°
38°
20
72°
39°
21
79°
38°
22
78°
37°
23
78°
40°
24
77°
40°
25
81°
33°
26
72°
31°
27
69°
34°
28
75°
30°
29
72°
29°
30
67°
32°
1
69°
35°
2
77°
38°
3
79°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Garden Valley
Garden Valley's September 2026 forecast shows daily high temperatures ranging from 67° to 91°, with overnight lows between 29° and 49°. The average high for September is 77° with an average low of 37°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Garden Valley. See also: October | November | December.
